Gas analysis, absorption and purification device for sulfuric acid production system

Abstract

The utility model belongs to the technical field of gas analysis and detection, and particularly relates to a gas analysis, absorption and purification device of a sulfuric acid production system, which comprises a sampling pipe and a three-way valve, one side of the sampling pipe is connected with the three-way valve through a pipeline, one outlet of the three-way valve is connected with a purification device, and the other outlet of the three-way valve is connected with a detection device; the purification device comprises a first-stage absorption tower, a second-stage absorption tower, a gas-liquid separation buffer tank and a vacuum pumping system, the first-stage absorption tower, the second-stage absorption tower, the gas-liquid separation buffer tank and the vacuum pumping system are sequentially connected through pipelines, and one outlet of the three-way valve is connected to the first-stage absorption tower through a pipeline. According to the device, the sampling pipe is connected to the purification device and the detection device through the three-way valve, so that the gas in the sampling pipe is prevented from being directly emptied, the gas in the sampling pipe can be replaced, effectively absorbed and purified, then the gas is analyzed and detected, and the effects of protecting the environment, reducing pollution and reducing emission are further achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas analysis and detection, in particular to a gas analysis absorption and purification device for a sulfuric acid production system. Background Art

[0002] Industrial sulfuric acid is a key raw material for chemical production. It is primarily produced through processes such as sulfur-based acid production, pyrite-based acid production, and smelting flue gas recovery. During production control, it undergoes incineration, conversion, and absorption steps. Its primary gas components are SO2, SO3, N2, and O2. The conversion rate of SO2 to SO3 (catalytic oxidation) is a key indicator for production process control. Accurate analysis of SO2 content directly impacts the long-term stable operation of production equipment. Therefore, major manufacturers include the control and monitoring of sulfur dioxide conversion rates as a routine analytical monitoring item, with frequent measurements.

[0003] Currently, conversion rate index analysis usually uses iodine titration or ion chromatography offline analysis. To ensure that the collected samples are sufficiently representative, the sampling valve must be opened and vented for 3-5 minutes before sampling to remove residual gas in the sampling tube. In this way, the gas in the replacement pipeline is directly discharged into the atmosphere without being effectively recovered, which will cause atmospheric pollution and even face pressure from law enforcement inspections by environmental protection departments. Utility Model Content

[0004] Aiming at the technical problem in the background technology that direct discharge of sampled replacement gas into the atmosphere will cause harmful acidic gas to pollute the environment, the utility model provides a gas analysis, absorption and purification device for a sulfuric acid production system.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0006] A gas analysis, absorption and purification device for a sulfuric acid production system comprises a sampling tube and a three-way valve, wherein one side of the sampling tube is connected to the three-way valve via a pipeline, one outlet of the three-way valve is connected to a purification device, and the other outlet is connected to a detection device; the purification device comprises a primary absorption tower, a secondary absorption tower, a gas-liquid separation buffer tank and a vacuum pumping system, wherein the primary absorption tower, the secondary absorption tower, the gas-liquid separation buffer tank and the vacuum pumping system are connected in sequence via pipelines, and one outlet of the three-way valve is connected to the primary absorption tower via a pipeline.

[0007] Optionally, the detection device includes a gas absorption reaction tube, a gas absorption thermometer, a gas measuring tube and a level bottle, and the gas absorption reaction tube, gas absorption thermometer, gas measuring tube and level bottle are connected in sequence through pipes, and one outlet of the three-way valve is connected to the gas absorption reaction tube through a pipe.

[0008] Optionally, a first liquid addition port and a first liquid discharge port are respectively provided at the bottom of the first-stage absorption tower, and a second liquid addition port and a second liquid discharge port are respectively provided at the bottom of the second-stage absorption tower.

[0009] Optionally, the upper end of the secondary absorption tower is connected to a gas-liquid separation buffer tank through a pipeline, and the bottom end of the gas-liquid separation buffer tank is connected to a second liquid addition port through a pipeline.

[0010] Optionally, the bottom end of the gas-liquid separation buffer tank is connected to the liquid adding port 1 through a pipeline.

[0011] Optionally, the vacuum pumping system includes an exhaust pipe and an exhaust pump arranged on the exhaust pipe, and one end of the exhaust pipe is connected to the upper end of the gas-liquid separation buffer tank.

[0012] Optionally, the three-way valve includes a three-way pipe and a valve core cooperating therewith, an L-shaped flow channel is provided inside the valve core, a valve seat is provided on the upper part of the three-way pipe, the valve core is arranged in the three-way pipe, a valve column is provided at one end of the valve core, the valve column extends from the inside of the valve seat, and a valve handle is provided at the upper end of the valve column; the upper end of the valve seat is provided with a mounting block through a plurality of limit columns, an arc-shaped plate extends on one side of the mounting block, and a locking mechanism is provided at the end of the arc-shaped plate, and when the valve handle is rotated to the locking mechanism position, the locking mechanism locks the valve handle.

[0013] Optionally, an arc-shaped positioning block is provided on the valve handle, and an arc-shaped positioning groove is provided on one side of the positioning block; the locking mechanism includes a cylinder and a retractable positioning shaft arranged inside the cylinder, and when the positioning shaft extends to the bottom of the arc plate, the valve handle rotates in the direction of the positioning shaft, so that the positioning shaft is clamped at the end of the positioning groove.

[0014] Optionally, a clamping hole is provided at the bottom of the end of the positioning groove, and the positioning shaft is fitted in the clamping hole.

[0015] Optionally, a bent limit block is provided on one side of the valve seat close to the mounting block, the valve handle is bent, and a slider is slidably provided on the bent portion of the valve handle, two clamping arms are extended from one side of the slider, and the slider can slide downward to clamp the clamping arms to clamp the limit block.

[0016] The utility model has the following advantages and beneficial effects:

[0017] In the present invention, a sampling tube is connected to a purification device and a detection device via a three-way valve. This prevents direct evacuation of the gas from the sampling tube prior to detection, effectively absorbing and purifying the gas within the sampling tube by replacement, and then performing gas analysis and detection, further protecting the environment, reducing pollution, and reducing emissions. By using a primary absorption tower and a secondary absorption tower in series, and using a gas-liquid separation buffer tank to separate gas and liquid, and then recovering the gas absorption liquid, a better absorption effect is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of the gas analysis and detection device for the sulfuric acid production system provided by the utility model;

[0019] Figure 2 This is a flow chart of the gas absorption and purification device for the sulfuric acid production system provided by the utility model;

[0020] Figure 3 This is one of the structural diagrams of the three-way valve provided by the utility model;

[0021] Figure 4 This is the second structural diagram of the three-way valve provided by the utility model;

[0022] Figure 5 for Figure 4 A top view of

[0023] Figure 6 for Figure 5 Right view;

[0024] Figure 7 for Figure 6 Cross-sectional view along the AA direction;

[0025] Figure 8 This is a structural diagram of the three-way valve provided by the utility model being opened and connected to the gas absorption and purification device;

[0026] Figure 9 for Figure 8 A half-section view of

[0027] Figure 10 This is a structural diagram of the three-way valve provided by the utility model being opened and connected to the gas analysis and detection device;

[0028] Figure 11 for Figure 10 A half-section view of

[0029] Icon: 1- sampling tube, 2- three-way valve, 2a- interface 1, 2b- interface 2, 2c- interface 3, 21- three-way pipe, 22- valve seat, 23- support seat, 231- limit block, 24- valve handle, 241- slide groove, 242- slider, 243- clamp arm, 25- valve column, 26- valve core, 261- flow channel, 27- mounting block, 271- arc plate, 272- limit column, 28- cylinder, 281- positioning shaft, 29- positioning block, 291- positioning groove, 292- Card connection hole, 3-gas absorption reaction tube, 4-gas absorption thermometer, 5-gas measuring tube, 6-latex hose, 7-level bottle, 8-primary absorption tower, 81-inlet pipe one, 82-gas distribution plate one, 83-liquid addition port one, 84-liquid discharge port one, 85-inlet pipe two, 86-gas distribution plate two, 9-secondary absorption tower, 91-liquid addition port two, 92-liquid discharge port two, 93-mixing discharge pipe, 94-gas-liquid separation buffer tank, 95-exhaust pipe, 96-valve body, 97-vacuum pump. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figure 1 、 Figure 2 As shown, a gas analysis absorption purification device for a sulfuric acid production system includes a sampling tube 1 and a three-way valve 2. One side of the sampling tube 1 is connected to the three-way valve 2 through a pipeline. One outlet of the three-way valve 2 is connected to the purification device, and the other outlet is connected to the detection device.

[0034] like Figure 1 As shown, the detection device includes a gas absorption reaction tube 3, a gas absorption thermometer 4, a gas measuring tube 5 and a level bottle 7. The gas absorption reaction tube 3, the gas absorption thermometer 4, the gas measuring tube 5 and the level bottle 7 are connected in sequence through pipes, wherein the bottom end of the gas measuring tube 5 is connected to the level bottle 7 through a latex hose 6, and one outlet of the three-way valve 2 is connected to the gas absorption reaction tube 3 through a pipe.

[0035] like Figure 2As shown, the purification device includes a primary absorption tower 8, a secondary absorption tower 9, a gas-liquid separation buffer tank 94 and a vacuum pumping system. The primary absorption tower 8, the secondary absorption tower 9, the gas-liquid separation buffer tank 94 and the vacuum pumping system are connected in sequence through pipelines, and one outlet of the three-way valve 2 is connected to the primary absorption tower 8 through a pipeline. The primary absorption tower 8, the secondary absorption tower 9 and the gas-liquid separation buffer tank 94 are made of stainless steel, organic glass, fiberglass, carbon fiber, PVC, PP and other materials.

[0036] Furthermore, the bottom of the first-stage absorption tower 8 is provided with a liquid addition port 1 83 and a liquid discharge port 1 84, respectively, and the bottom of the second-stage absorption tower 9 is provided with a liquid addition port 2 91 and a liquid discharge port 2 92, respectively. The upper end of the first-stage absorption tower 8 is provided with an air inlet pipe 1 81, which is connected to the bottom end of the first-stage absorption tower 8, and a gas distribution plate 1 82 is provided at the bottom end, and one end of the air inlet pipe 1 81 is connected to the three-way valve 2. The upper part of the first-stage absorption tower 8 is provided with an air inlet pipe 2 85, which extends from the upper end of the second-stage absorption tower 9 to the bottom end of the second-stage absorption tower 9, and a gas distribution plate 2 86 is provided at the bottom end. The upper end of the second-stage absorption tower 9 is connected to the gas-liquid separation buffer tank 94 through a mixing discharge pipe 93.

[0037] The primary absorption tower 8 and the secondary absorption tower 9 are filled with a sodium hydroxide absorption solution with a concentration of 20-40%, or an alkaline absorption solution such as potassium hydroxide absorption solution. The solution filling height is 1 / 3 of the absorption tower and can be reused during the analysis and detection process. When the absorption reaches saturation, it is discharged from the drain port and refilled with new alkaline absorption solution before being reused.

[0038] As a preferred embodiment of the present invention, the bottom end of the gas-liquid separation buffer tank 94 is connected to the second liquid adding port 91 through a pipeline.

[0039] As another preferred embodiment of the present invention, the bottom end of the gas-liquid separation buffer tank 94 is connected to the liquid adding port 1 83 through a pipeline.

[0040] That is, the absorption liquid recovered from the gas-liquid separation buffer tank 94 can be recovered separately into either the primary absorption tower 8 or the secondary absorption tower 9, or can be recovered simultaneously into both absorption towers.

[0041] The vacuum pumping system includes an exhaust pipe 95 and an exhaust pump 97 arranged on the exhaust pipe 95. A valve body 96 is provided on the exhaust pipe 95. One end of the exhaust pipe 95 is connected to the upper end of the gas-liquid separation buffer tank 94 for discharging the purified gas.

[0042] Example 2

[0043] During normal operation, it is necessary to first open the three-way valve 2 from the closed state to connect the three-way valve 2 with the purification device, replace the gas in the sampling tube 1, and discharge it into the purification device for gas purification. After purification for a period of time, connect the three-way valve 2 with the detection device for gas detection.

[0044] However, in actual operation, due to the influence of the on-site environment, the direction markings of the three-way valve 2 are easily blurred. When operating the three-way valve 2, it is difficult for the operator to distinguish whether the three-way valve 2 is connected to the purification device or the detection device. If the gas is directly tested without purification, inaccurate detection will occur. Based on the above technical problems, further optimization design is carried out.

[0045] As shown in Figures 1 to 11, the three-way valve 2 includes a three-way pipe 21 and a valve core 26 that cooperates therewith. The three-way valve 2 adopts a conventionally designed three-way ball valve, and an L-shaped flow channel 261 is provided inside the valve core 26. A valve seat 22 is provided on the upper part of the three-way pipe 21, and a support seat 23 is provided on the upper part of the valve seat 22. The valve core 26 is arranged in the three-way pipe 21, and a valve column 25 is provided at one end of the valve core 26. The valve column 25 extends from the inside of the valve seat 22. A sealing member can be provided between the inside of the valve seat 22 and the valve column 25 to enhance the sealing effect. A valve handle 24 is provided on the upper end of the valve column 25. By rotating the valve handle 24, the valve core 26 is driven to rotate, so that the flow channel 261 can be connected to different interfaces, thereby achieving the opening and closing effect of the three-way valve 2. A mounting block 27 is provided on the support seat 23 at the upper end of the valve seat 22 through a number of limit columns 272. An arc-shaped plate 271 extends from one side of the mounting block 27. A locking mechanism is provided at the end of the arc-shaped plate 271. When the valve handle 24 is rotated to the locking mechanism position, the locking mechanism locks the valve handle 24.

[0046] In the present invention, the three-way valve 2 has three ports: port 1 2a, port 2 2b, and port 3 2c. Port 3 2c is located directly below the mounting block 27, while port 2 2b is located on the opposite side of port 3 2c. The locking mechanism is located directly above port 2b, i.e., on the opposite side of the mounting block 27.

[0047] like Figures 3 to 7 As shown, to facilitate the on / off identification of three-way valve 2, when the handle is rotated to directly above interface 1 2a, one end of flow channel 261 is blocked by the three-way tube 21, and the other end opens to interface 2 2b. Interface 1 2a is marked as the gas inlet, that is, interface 1 2a is connected to sampling tube 1. In this case, three-way valve 2 is in the closed state. At this time, one side of the valve handle 24 has a mounting block 27, and the bottom end of the mounting block 27 has several limiting posts 272. Therefore, the presence of the limiting posts 272 completes the position of the valve handle 24. When the valve handle 24 is rotated to directly above interface 1 2a, one side of it is closely pressed against the limiting posts 272 and is limited, and the valve handle 24 is in the closed position.

[0048] like Figure 8 、 Figure 9 As shown, valve handle 24 is rotated 90° from port 1 2a toward port 2 2b. At this point, valve handle 24 is directly above port 2b, and the locking mechanism is aligned with valve handle 24, locking valve handle 24. At this point, flow channel 261 is connected to port 1 2a at one end and opens to port 2 2b at the other. Port 1 2a is designated as the gas inlet, and port 2 2b is designated as the purification device inlet. In other words, port 1 2a is connected to sampling tube 1, and port 2 2b is connected to the purification device. In this case, three-way valve 2 is open, performing a gas purification operation.

[0049] like Figure 10 、 11 As shown, after the purification is completed, the locking mechanism releases the lock on the valve handle 24, and then continues to rotate the valve handle 24, so that the valve handle 24 rotates 90° away from the interface 1 2a. At this time, the valve handle 24 rotates to the opposite side of the interface 1 2a, and one side of the valve handle 24 abuts the limit column 272 to reach the fully open position. At this time, one end of the flow channel 261 is connected to the interface 1 2a, and the other end opens to the interface 3 2c. The interface 1 2a is recorded as the gas inlet, the interface 2 2b is recorded as the purification device inlet, and the interface 3 2c is recorded as the detection inlet, that is, the interface 1 2a is connected to the sampling tube 1, and the interface 3 2c is connected to the detection device. In this case, the three-way valve 2 is in the open state, and the gas detection operation is performed.

[0050] Furthermore, the valve handle 24 is provided with an arc-shaped positioning block 29, and one side of the positioning block 29 is provided with an arc-shaped positioning groove 291. The locking mechanism includes a cylinder 28 and a retractable positioning shaft 281 provided inside the cylinder 28. When the positioning shaft 281 extends to the bottom of the arc plate 271, the valve handle 24 rotates toward the positioning shaft 281, so that the positioning shaft 281 is clamped at the end of the positioning groove 291 (such as Figure 8 As shown), the valve handle 24 is positioned after being rotated 90°, ensuring that when the three-way valve 2 is initially opened, the gas is allowed to pass into the purification device for purification, avoiding the situation where the valve handle 24 is opened too large due to human factors, causing the gas to pass into the detection device for detection without being purified, resulting in inaccurate detection.

[0051] Furthermore, a clamping hole 292 is provided at the bottom of the end of the positioning groove 291, and the positioning shaft 281 is cooperatively disposed in the clamping hole 292 to achieve complete limiting fixation.

[0052] When the valve handle 24 is fully opened and rotated 180°, the three-way valve 2 opens the gas to the detection device. In this case, the positioning shaft 281 extends to the bottom end of the arc block 271, which prevents the valve handle 24 from rotating back and ensures that the three-way valve 2 is connected to the detection device. When the three-way valve 2 needs to be closed, the positioning shaft 281 is moved upward and the handle is rotated back 180°.

[0053] In the present invention, the structure of the positioning shaft 281 and the cylinder 28 can be a threaded connection method, where the positioning shaft 281 is threadedly connected to the inner wall of the cylinder 28, or a common latch-type structure.

[0054] Furthermore, a bent stop block 231 is provided on one side of the valve seat 22 near the mounting block 27. The stop block 231 is provided just above the interface 1 2a. The valve handle 24 is bent, and a slider 242 is slidably provided on the bent portion of the valve handle 24. Specifically, a slide groove 241 is provided on the bent portion of the valve handle 24, and the slider 242 is slidably provided in the slide groove 241. Two clamping arms 243 are provided on one side of the slider 242. The slider 242 can slide downward to clamp the clamping arms 243 to clamp the stop block 231 (as shown in FIG. Figure 4 In this case, the valve handle 24 is limited and cannot be rotated, thereby avoiding misoperation after the valve handle 24 is closed. When the valve handle 24 needs to be rotated, the slider 242 needs to be slid up so that the clamping arm 243 leaves the limit block 231, and the valve handle 24 can be rotated to open the three-way valve 2.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A gas analysis, absorption and purification device for a sulfuric acid production system, characterized in that : It includes a sampling tube and a three-way valve, one side of the sampling tube is connected to the three-way valve through a pipeline, one outlet of the three-way valve is connected to the purification device, and the other outlet is connected to the detection device; the purification device includes a primary absorption tower, a secondary absorption tower, a gas-liquid separation buffer tank and a vacuum pumping system, the primary absorption tower, the secondary absorption tower and the gas-liquid separation buffer tank, and the vacuum pumping system are connected in sequence through pipelines, and one outlet of the three-way valve is connected to the primary absorption tower through a pipeline.

2. The sulfuric acid production system gas analysis absorption purification device according to claim 1, characterized in that: The detection device includes a gas absorption reaction tube, a gas absorption thermometer, a gas burette and a level bottle, which are connected in sequence through pipelines, and one outlet of the three-way valve is connected to the gas absorption reaction tube through a pipeline.

3. The gas analysis, absorption and purification device for sulfuric acid production system according to claim 1, characterized in that: The bottom of the first-level absorption tower is respectively provided with a first liquid addition port and a first liquid discharge port, and the bottom of the second-level absorption tower is respectively provided with a second liquid addition port and a second liquid discharge port.

4. The sulfuric acid production system gas analysis absorption purification device according to claim 3, characterized in that: The upper end of the secondary absorption tower is connected to the gas-liquid separation buffer tank through a pipeline, and the bottom end of the gas-liquid separation buffer tank is connected to the second liquid addition port through a pipeline.

5. The gas analysis, absorption and purification device for sulfuric acid production system according to claim 4, characterized in that: The bottom end of the gas-liquid separation buffer tank is connected to the liquid adding port 1 through a pipeline.

6. The gas analysis, absorption and purification device for sulfuric acid production system according to claim 4, characterized in that: The vacuum pumping system includes an exhaust pipe and an exhaust pump arranged on the exhaust pipe, and one end of the exhaust pipe is connected to the upper end of the gas-liquid separation buffer tank.

7. The gas analysis, absorption and purification device for sulfuric acid production system according to claim 1, characterized in that: The three-way valve includes a three-way pipe and a valve core matched therewith, an L-shaped flow channel is provided inside the valve core, a valve seat is provided on the upper part of the three-way pipe, the valve core is arranged in the three-way pipe, a valve column is provided at one end of the valve core, the valve column extends from the inside of the valve seat, and a valve handle is provided at the upper end of the valve column; a mounting block is provided at the upper end of the valve seat through a number of limit columns, an arc-shaped plate extends on one side of the mounting block, and a locking mechanism is provided at the end of the arc-shaped plate. When the valve handle is rotated to the locking mechanism position, the locking mechanism locks and fixes the valve handle.

8. The gas analysis, absorption and purification device for sulfuric acid production system according to claim 7, characterized in that: An arc-shaped positioning block is provided on the valve handle, and an arc-shaped positioning groove is provided on one side of the positioning block; the locking mechanism includes a cylinder and a retractable positioning shaft arranged inside the cylinder. When the positioning shaft extends to the bottom of the arc plate, the valve handle rotates in the direction of the positioning shaft, so that the positioning shaft is clamped at the end of the positioning groove.

9. The gas analysis, absorption and purification device for sulfuric acid production system according to claim 8, characterized in that: A clamping hole is provided at the bottom of the end of the positioning groove, and the positioning shaft is fitted in the clamping hole.

10. The gas analysis, absorption and purification device for sulfuric acid production system according to claim 8, characterized in that: A bent limit block is provided on one side of the valve seat close to the mounting block, the valve handle is bent, and a slider is slidably provided on the bent portion of the valve handle, two clamping arms are extended on one side of the slider, and the slider can slide downward to clamp the clamping arms to clamp the limit block.

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